Thermodynamics Mid Exam 19 PDF [PDF]

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KEMENTERIAN RISET, TEKNOLOGI DAN PENDIDIKAN TINGGI UNIVERSITAS JEMBER FAKULTAS TEKNIK Alamat: Jl. Kalimantan No. 37 Kampus Bumi Tegal Boto Kotak POS 159 Jember 68121 Telp. 0331-484977, Fax. 0331-484977 www.teknik.unej.ac.id



SOAL UJIAN TENGAH SEMESTER GENAP TAHUN AKADEMIK 2018/2019 Mata Kuliah/Kelas



: Dasar Mekanika Fluida dan Perpindahan Panas



Program Studi



: Teknik Kimia



Dosen Penguji



: Rizki Fitria Darmayanti



Batas Pengumpulan



: Kelas A: Jumat, 26 April 2019 Kelas B: Kamis, 25 April 2019



NO. 1 A particular power plant operates with a heat-source reservoir at 623.15 K (350°C) and a heat-sink reservoir at 303.15 K (30°C). It has a thermal efficiency equal to 55% of the Carnot-engine thermal efficiency for the same temperatures. (a) What is the thermal efficiency of the plant? (b) To what temperature must the heat-source reservoir be raised to increase the thermal efficiency of the plant to 35%? Again efficiency is 55% of the Carnot-engine value. NO. 2 An egg, initially at rest, is dropped onto a concrete surface; it breaks. Prove that the process is irreversible. In modeling this process treat the egg as the system, and assume the passage of sufficient time for the egg to return to its initial temperature. NO. 3 How much heat is required when 10.000 kg of CaCO3 is heated at atmospheric pressure from 323.15 to 1153.15 K (50°C to 880°C)? NO. 4 Calculate the theoretical flame temperature when ethylene at 298.15 K (25°C) is burned with: (a) The theoretical amount of air at 298.15 K (25°C). (b) 25% excess air at 298.15 K (25°C).



NO. 5 Please give some suggestion for me and our class.



Please submit the answer next week in our class.



Enjoy working!